---
id: w3css-padding
title: "W3CSS Padding"
category: "Programming_Language"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["w3-padding classes", "W3.CSS 패딩"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-07-04
updated_at: 2026-07-04
review_reason: ""
merge_history: []
tags: ["w3css", "css-framework", "w3schools", "padding"]
raw_sources: ["https://www.w3schools.com/w3css/w3css_padding.asp"]
applied_in: []
github_commit: ""
---

# [[W3CSS Padding]]

## 🎯 한 줄 통찰 (One-line insight)
W3.CSS splits padding into TWO separate class families with different behavior — "number" classes (`w3-padding-16` through `w3-padding-64`) add ONLY top/bottom padding, while "size" classes (`w3-padding-small`/`w3-padding`/`w3-padding-large`) add ALL FOUR sides at different top/bottom vs. left/right ratios — meaning the choice of class family determines whether you're adjusting vertical space alone or the whole box uniformly. [S1]

## 🧠 핵심 개념 (Core concepts)
- **Padding-number classes** — `w3-padding-16/24/32/48/64` add ONLY top+bottom padding at that pixel value. [S1]
- **Padding-size classes** — `w3-padding-small` (4px top/bottom, 8px left/right), `w3-padding` (8px/16px), `w3-padding-large` (12px/24px) — all FOUR sides, with left/right always double the top/bottom value. [S1]

## 📖 세부 내용 (Details)
- Number class: `<div class="w3-panel w3-padding-16"><p>I have 16px top and bottom padding.</p></div>`. [S1]
- Size class: `<div class="w3-panel w3-padding-large"><p>I have 12px top and bottom padding and 24px left and right padding.</p></div>`. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
- **두 클래스 계열의 방향 차이**: 숫자 클래스는 상하 패딩만, 크기 클래스는 4면 모두(좌우가 상하의 2배) 적용한다는 점이 명확히 구분됨. [S1]

## 🛠️ 적용 사례 (Applied in summary)
현재 발견된 실제 적용 사례가 없습니다 — 패널 내부 여백을 세밀하게 조정할 때 숫자/크기 클래스 중 선택하는 것이 실전 레이아웃 조정의 기준이다. [S1]

## 💻 코드 패턴 (Code patterns)
Size class applying padding to all four sides asymmetrically (HTML):
```html
<div class="w3-panel w3-padding-large">
  <p>12px top/bottom, 24px left/right — left/right is always 2x top/bottom.</p>
</div>
```

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[W3.CSS Tutorial]]
- **관련 개념:** [[W3CSS Round]], [[W3CSS Margins]]
- **참조 맥락:** 여백(padding) 시스템 — 마진(Margins) 챕터로 이어짐.

## 📚 출처 (Sources)
- [S1] W3Schools — W3.CSS Padding — https://www.w3schools.com/w3css/w3css_padding.asp

## 📝 변경 이력 (Change history)
- 2026-07-04: Initial draft synthesized from the W3Schools "W3.CSS Padding" page (Astra wiki-curation, P-Reinforce v3.1 format).